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1 <br /> 1 .0 Introduction <br /> Southdown, Inc. , a corporation doing business in the State of <br /> Colorado as Southwestern Portland Cement Company, owns and <br /> operates a cement manufacturing plant and associated quarries two <br /> miles east of Lyons, in unincorporated Boulder County. The <br /> existing quarries are nearing the end of feedstock production, <br /> and Southdown will open new quarries one mile north of the plant <br /> at a location known as Dowe Flats. Accordingly, the new quarry <br /> is called the Dowe Flats Project (Project) . The Dowe Flats <br /> quarries are planned to provide feedstock for the plant for 25 <br /> years .' <br /> The mine quarries and associated topsoil and waste rock <br /> stockpiles include an impact zone of 385 acres. The 1, 955 acre <br /> mine permit boundary includes the impact zone and an undeveloped <br /> and undisturbed buffer zone. <br /> The area known as the Dowe Flats project site is located east and <br /> north of Lyons, Colorado and west of Longmont, Colorado. Rabbit <br /> Mountain borders the Study Area on the east, the St . vrain Creek <br /> is the border on the south and Indian Mountain borders the <br /> project area to the west. The Dowe Flats topography is flat to <br /> rolling with an elevation of approximately 5200 feet at the <br /> southeast corner to 5500 feet at the northern border. The Supply <br /> Canal, the Highland Ditch, the Rough and Ready Ditch and the <br /> Palmerton Ditch provide water and cross the Flats in a generally <br /> west to easterly direction. Several springs are located near <br /> Rabbit Mountain. (See Figure I) . <br /> 'For additional detail the reader is referred to the Dowe <br /> Flats Permit Documents including the Boulder County Special Use <br /> Permit Application (1993) , the Colorado Mined Land Reclamation <br /> 112 Permit Application (1993) and Supplemental Technical <br /> Appendices (1993) . <br />